Alarm mechanism



1,486,096 S. LIGAMMAR ET AL March 4 1924.

ALARM MECHANISM Filed 001:. 1.

1921 2 Sheets-Sheet 1 JaZ/a i0]? ATTORNEY WITNESS.

. 'March 4 1924. 1,486,096

' s. LIGAMMAR ET AL ALARM MECHANISM Filed Oct. 1. 1921' 2 Sheets-Sheet 2 Jxf I I fix,

l /.21? i s maivmlyamaz; Zamardfiallzg Patented Mar. Q, 1924..

SALVATORE LIG-AR, OF CHICAGO, ILLINOIS, AND BERNARD DALLIO, OF 20131,

NEW JERSEY.

ALARM MECHANISM.

To all whom it may concern:

Be it known that we, SALVATORE LIGAM- MAR and BERNARD DALLIO, citizens of the United States of America, residin at Chicago and Lodi, in the counties of aook and Bergen and States or" Illinois and New J ersey, respectively, have invented new and useful Improvements in Alarm Mechanism, of which the following is a specification.

This invention relates to alarms and more particularly to burglar alarms.

An object of this invention is the provision of an alarm mechanism which may be conveniently attached to a door or closure, and when so attached, the same may be set as to give an alarm, should an attempt be made to force an entrance.

Another object is the provision of an alarm mechanism which may be made inoperative by an authorized person should it be desired to open said door or closure.

Another object of the invention is the p10 vision of an alarm mechanism including an alarm box, said alarm box having means for automatically firing a number of blank cartridges, successively.

With these and other objects in view, the invention resides in the novel construction and arrangement of parts, the essential features of which are hereinafter fully described, are particularly pointed out in the appended claims and are illustrated in the accompanying drawings, in which Figure 1, is a side elevation of a door and jamb showing the invention applied thereto.

Figure 2 is a View of the alarm mechanism with the cover removed, showing parts in section.

Figure 3, is a vertical section on the line 3-3 of Figure 2.

Figure 4:, is a detail section on the line 4-4 of Figure 1.

Figure 5, is a view similar to Figure 2, showing a slightly modified form of the alarm mechanism.

Figure 6, is a vertical section on the line 6-6 of Figure 5.

Like characters of reference refer to like parts in all views.

In the drawings, the numeral 10 indicates a door or closure and 11 the jamb, to which the invention is shown applied thereto. Attached to the inside of the door 10, by any suitable means is an alarm box 12, having a swinging cover 13 to allow access to the alarm mechanism which will now be described.

' Enclosed in the alarm box '12 is a plate 14 the same being pivoted in the side walls of the box as at 15. Slots 16-16 are provided in the plate 14 for the reception of bolts 17-17 carried by the rear wall of the box 12, Washers 18 and nuts 19 are received by the bolts -17-17. Fastened to the plate 14 are flat springs 20, the extremities ofwhich are extensions 21, said extensions terminating in fingers 22, thefingers 22 being of different lengths for the purpose to be presently described. A firing pin 23 is formed on the underside of the extensions 21. A trigger 24: is pivoted as at 25 to the box 12. A spring 26 is secured to the trigger 24 and to one of the bolts 17. v A lip 27 is formed on the trigger 24. Engageable with the lip 27 is a book 28 formed on one extremity of a rock arm 29, the opposite end of said rock arm extending out through a slot 30 in the box 12, and carrying a roller 31. A spring 32 constantly forces the hooked end 28 upward for engagement with the lip 27 The rock arm 29 is mounted on a slide 33 as at 34, said slide being fastened to a latch bar 35 controlled by a lock mechanism 36 of the usual construction. A bolt 37 is secured to the latch 35, the same adapt ed to enter a keeper 38. The bolt 87 is weakened as at 39 for the purpose to be presently described.

Secured to the jamb 11 is what I shall term, a cam plate 10 having a cam surface 41 which receives the roller 31 of the rock arm 29. r

In the operation of the device, should it be desired to set the alarm, the nuts 19 and washers 18 are first removed from the bolts 17 and the plate 1 1 carrying the springs 20 swung out so that the fingers 22 will engage with the trigger 2 1. The cartridges 42 are then inserted in the openings 43 in the rear wall of the casing 12. This being done the Washers 18 and nuts 19 are placed back on the bolts 17 and screwed down as shown in Figure 3. By screwin the plate 141 down against the rear of the box 12 the springs 20 will be placed under tension. During this procedure the latch 35 has been in retracted position and a dog 44. engaging the lip 27. A key is now inserted in the lock 36 and the bolt 37 enters its keeper 38 and at the same time the hook 28 engages 7 trance be'forced Toy some noun l 7 J i I H em: 5" r from, ahomng ilEQ airing nus 3; to dis 1 ngfi m P :Y. cnerge the com-urges es success 'ely.

3 n A mi. W, ohouid on euihoimeu poison. desiie to open the door only nee sort the necessary v and "ruct which will render Will be readily seen.

In l igr're 5, have n .1 v ll 1" "s 4 modified iorni oi sizing mean consists of L 56 remove ly s the rear Wall or the box 12 manner as the plate M in form. The block inc ude? pins 52. Spring ere V tween the pins 52 end well of 50; Secured to the pins 02 and extending through slots 5 in the olocl: are "'ers 5 engegeeble with the trigger The operation of this form is similar to the prererred form in that the trigger s4- relesses the fingers 55, thereby allowing the springs 59; to

force the firing pins 52 into contact With the cartridges.

Having described what We consider the preferred form of our invention, We Went it to be understood that the device may be pieced on Windows and other closures should the some he desired; also that changes, elterations and modifications which fail Within the appended claims may be resorted to when" so desired. What is claimed es new is r 1. in a device of the class described, the combination of a closure member ends ststionsry member, an alarm inechenisin se-- cured to said closure member including a plurality of cartridges, a plurality inovsble firing pins edepted to comet With the said cartridges, end his ns holding the pins in set position, is operative upon the opening of the o ber to: so tueting said firs mentioned n" 1" to cause said firing pins to explode scid'certridges seriatino, and a lever included in the alarm coscting with tie bolt, end ineen adoptcd to he secured in fixed relation to 'vih SM-1i rocker the door and coco-ting so as ectuote solid rockerto release tire setto tirg' means when the opened aside from legit mite ectueti 1 L18 bolt, ne'sns for positioning s detonotor in co -acting, relation to the tiring pin, the connection between the rocker and aid bolt serving to re- The lease the rocker ssid settinginechsnism on leg note actnstions or the bolt An alertniechnnisin adopted to be secured to a closure member comprising a housing, at plurality of spring pressed tiring so pin" mounted therein and normally sold in operative position by means or" a trigger, a plurality oi" detonators, a rocker engaging trigger and operative by means of a cs2; adopted to be secured to a stationary es In nloer for releasing said firing pins seri- An alarm mechanism adapted to be secured to e closure member comprisings onsing, s plate pivoted in casing, a pluso rslity of spring pressed firing pins mounted on said plate and normally held in operati e position by means of s trigger, a plurality of detonators, a slide mounted in said casing, a lever pivoted on said slide end held in engagement with the trigger when the is in operative position, and means secured to e stationery inemberifor engagement with the lever for releasing the detonators serintirn. 7

5. An elsrin mechanism adapted to be secured, to is closure member comprising a housing, a plurality oi spring pressed detonators, mounted therein and normally held in operative position by means of a trigger, v 5 a rocker engaging said trigger and operative by means of a coin adopted to be secured to e stationery member for releasing said detonators seri'etiin, a key controlled bolt co scting With said trigger engaging 1 means ior render ng the device operative and inoperative.

- In testimony whereof We have erhxed our signatures. I

SALVATQRE LIGAMMAR. BERNARD DALLIO. 

